iio:ad5686: Report scale as fractional value

Move the complexity of calculating the fixed point scale to the core.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

diff --git a/drivers/iio/dac/ad5686.c b/drivers/iio/dac/ad5686.c
index f472b48445f6f122074a57ee2fd4478c60580cc9..30e506e37dd26adb6ad0510f8be0f1ca298b786d 100644 (file)
--- a/drivers/iio/dac/ad5686.c
+++ b/drivers/iio/dac/ad5686.c
@@ -201,7 +201,6 @@ static int ad5686_read_raw(struct iio_dev *indio_dev,
                           long m)
 {
        struct ad5686_state *st = iio_priv(indio_dev);
-       unsigned long scale_uv;
        int ret;
 
        switch (m) {
@@ -214,12 +213,9 @@ static int ad5686_read_raw(struct iio_dev *indio_dev,
                *val = ret;
                return IIO_VAL_INT;
        case IIO_CHAN_INFO_SCALE:
-               scale_uv = (st->vref_mv * 100000)
-                       >> (chan->scan_type.realbits);
-               *val =  scale_uv / 100000;
-               *val2 = (scale_uv % 100000) * 10;
-               return IIO_VAL_INT_PLUS_MICRO;
-
+               *val = st->vref_mv;
+               *val2 = chan->scan_type.realbits;
+               return IIO_VAL_FRACTIONAL_LOG2;
        }
        return -EINVAL;
 }